Manufacture of rope-clamps for well-drilling cables.



0. F. RIGBY.

MANUFACTURE OF ROPE CLAMPS FOR WELL DRILLING GABLES.

APPLICATION FILED JULY 28,1913. 1,120,539.

INVENTOR Patented Dec. 8, 1914.

' 2 a section"- WMTE CLARK F. RIG-BY, OF BUTLER, PENNSYLVANIA.

MANUFACTURE OF ROPE-CLAMPS FOR WELL-DRIILING CABLES.

Specification of Letters Patent,

Patented Dec. 8, 1914.

Application filed July 28. 1913. Serial No. 781,581.

1/ '1) all w/umzit may concern:

Be it known that I, CLARK F. RIGBY, a citizen of the United States, and resident of Butler, in the county of But-ler'and State of lennsylvania, have invented certain new and useful Improvements in Manufacture of Rope-Clamps for Well-Drilling Cables, of which the following is a specification.

In the manufacture of rope clamps for well drilling cables having depressed slip guideways, for example, as shown in my Patent No. 873,090, granted December 10, 2 07, the fora-ring of such guideways is laborious and expensive as they must be machined after the clam body has been cast or forged. Also, dilculty has been experienced in. obtaining accurate and uniform downward convergence of the guideways, and this has been particularly pronounced with clamps having sectional or two-part bodic. as shown in my above mentioned ptent. due to the great difliculty in mainng uni-Form lines in the heavy castings or torgings.

The present invention is designed to overcome the dilliculties noted and obtain absolute accuracy and interchangeability by the method and means hereinafter described and claimed which, and while illustrated in connection with a tional or two-part clamp body, its use is not thus restricted.

.iilcchanisni embodying the impro;cnients and by means of which the invention is practised .is illustrated in the accon'ipanyiug drawings, Figure 1 being a vertical longitudinal. section of such improved incchanisni. talrcn on line l-l oi Fig. l, and Fig. l plan on line JQ of Fig. 1. 'tical section of the sectional 'lis an clm'ation of the core with .3 thereof fitted together, and Fig. 5 similar View with the parts separated. Hlt, shown. the clarnp ljuidy is formed in two vertical hali'cs 2 and I3 united at one ;i"c by hinge l and at the opposite side adapted to he sccurcd together by clamp 5, ll as shown in my abow mentioned patent. The inner sides of scctions 1 and 3 are rcrcsscd vertically to form when (l(.- 'if(l the downwarillv tapering bow or cavity ll which is usually ci cular in cross section.

lll--'ii':1(l of mach ning the slidcwavs iu the bore wall to he rope-gripping slips. being the method employed in producing the guidearfl's iu the clamp iii my above nicniioucil patent. l cast on iorgc the clamp body with the relatively large upright depressions 7 which are preferably of dovetail cross-sectibn, and while the opposite depressions converge downwardly, great accuracyneed not be observed either as to such convergence or as to exact cross sectional shape. Adapted to fit within and fill the clamp bore isa core which consists of the outer sections 8 and 9, each substantially semi-circular in plan,- and adapted to fit therebetween is the central or intermediate section which may be constructed at its upper end with handle 10. At opposite sides of the core the three sections 8, 9 and 10 are widened out to form the pattern projections 11 which extend into but only partially fill depression 7, as shown in Figs. 1 and 2. Projections 11 are of dove-tail section in order to form clove-tail slideways in the Babbitt'or other soft metal 12 which is filled or cast therearound in depressions 7, the latter locking the metal therein.

The accuracy with which the core is formed, combined with its downward taper, causes it to closely fit within and fill the clamp bore and at the same time center the pattern projections 11 in depressions 7, the

race slideways are produced in and by the metal 12, this regardless of inaccuracies or laclr of exact correspondence between deg 'cs sions 7. By this means slip guideways that correspond in size andin taper or dosin ard convergence are produced in all clamps constructed as herein described so that slips and clamp body parts may be used interchangeably and always produce maXimum efliciency. Y

The flat central core section 10 is wedge shaped, and the inner races of sections 8 and J diverge upwardly in exact correspondence with the taper of section 10, so that the core expands or spreads uniformly from top to bottom when the wedge is inserted and is thus caused to accurately and completely fill the clamp cavity. Dowel pins 13 carried by section 9 and fitting depressions 14 in section 9 insure accurate relative movement and fitting of the core parts. The dowel pins are embraced by a slot 15 in the central wedge section 10, whereby the latter is accurately directed when being inserted as well as when being removed. By referring to Figs. [,and 5 it will be seen t at the outer edges I l of patterns 11 are p rallel at all times, notwithstanding the upward diversult being that absolutely true and accu-.

gence of their inner edges 16' carried by the core sections 8 and 9, also notwithstanding the upward divergence of the opposite edges 17 of the portions of the pattern carried by the wedge section 10.

In operation, sections 8 and 9 are first placed within the clamp-body cavity, being maintained in accurate relation by dowel's 13, and the central section 10 is then inserted and fully spreads 0r expands the core within the clamp recess and fills and completes the formation of patterns 11 in cavities 7. After metal 12 has been poured or cast, as above described, and has become set, wedge 10 is withdrawn, thereby releasing parts 8 and 9 and. permitting their undercut grooves and dove-tail edges to clear the corresponding edge projections of metal 12, and with the core thus entirely freed it may be readily removed.

In an application filed concurrently herewith, I have made claims for a clamp body having guideways of the form herein dis closed.

I claim:

1. In the manufacture of rope clamps, the combination of a clamp body formed with a through rope passage and with longitudinal depressions in opposite faces of the passage, of a core removably fitting within and filling the rope passage excepting the longitudinal depressions thereof, and longitudinal slideway-forming projections on opposite sides of the core which are adapted to enter and partially fill said longitudinal depressions for receiving slideway-forming metal.

2. In the manufacture of rope clamps, the combination with a clamp body formed with a downwardly tapering bore and with upright depressions in opposite portions of the bore, of a downwardly tapering core closely fitting within the bore and downwardly converging lateral projections on the core adapted to enter the bore depressions and define spaces within I said depressipns for slideway-forming metal.

3. In the manufacture of rope clamps, the

i combination with a clamp body formed with a downwardly tapering bore and with upright depressions in opposite portions of the bore of dove-tail cross-section, of a downwardly tapering core closely fitting Within the bore, and downwardly converg ing'lateral pro ections of dove-tall. cross-.

section on the core adapted to enter the bore depressions, the projections being of dovetail crossscction andcombining with the bore. depressions to form spaces for receiving slideway-forming metal.

4. In the manufacture or rope clamps, the combination of a clamp body formed with a through rope passage and with longitudinal depressions in opposite faces of the passage, of a core rcmovably fitting within sions,

to center the longitudinal depressions and define a space within each depression for receiving metal which forms a slideway of dove-tail cross-section.

53. In the manufacture of rope clamps, the combination with a hollow clamp body having opposite depressions in its inner wall, of a core fitting the interior of the body and having pattern-forming projections at opposite sides which extend into said depressions, the core formed in sections with one of the sections adapted to be removedfor collapsing the core and facilitating its removal.

6. In the manufacture of rope clamps, the combination with a hollow clamp body having opposite depressions in its inner wall, of a core fitting the interior of the body and having pattern-forming projections at opposite sides which extend into said depressions, the

core formed in three upright sections with a portion of each pattern-forming projection carried by each section and with one of the sections adapted to be removed for collaps-v ing the core and facilitatingits removal.

7. In the manufacture of rope clamps, the combination with a hollow clamp body having opposite depressions in its inner wall, of a core fitting the interior of the body and having pattern-forming projections at opposite sides which extend into said depres sions, the core formed in two outer sections and a third intermediate section fitting between the outer sections, portions of the guideway-forming patterns carried by each of the three sections and with the interme-. diate section adapted to be removed for collapsing the core and facilitating its removal from the clamp body.

8. In the manufacture of rope clamps, the combination with a hollow clamp body having opposite depressions in its inner wall, of a core fitting the interior of the body and having pattern-forming projections at opposite sides which extend into said depresthe core divided vertically and transversely into three sections with portions of the pattern-forming projections carried 'by each section, the intermediate section and the portions of the patterns ca-rriedthereby tapering downwardly and the inner faces of the outer sections and. the portions'of the pattern projections carried, thereby diverging upwardly complementary with the taper of the intermediate section. 1 y I 9'. In the manufacture of rope clamps, the

combination with a hollowclamp bcdy hav" the core formed in three "ertical sections with a portion of each pattern-forming proection carried by each section, each compicte pattern-forming projection having parallel upright edges carried, respectively. by the outer core sections, the portion of each pattern carried by the intermediate core section tapering downwardly and the inner faces of the portions of each pattern carried by the outer core sections diverging upwardly complementary with said downward taper, whereby when the core sections and the pattern portions carried thereby are titted together they combine to form pattern projections of uniform width from top to bottom.

10. In the manufacture of rope clamps, the combination with a hollow clamp body having opposite depressions in its inner wall,

&

of a core fitting the interior of the body and having pattern-forming dprojections at 0pposite sides which exten into said depressions, the core consisting of two outer sections and a central section removably fitting therebetween, dowels removably connecting the outer sections and the intermediate section slotted vertically to pass otter the dowels, and pattern-forming projections carried by the sectional core and extending into the depressions in the wall of the body cavity.

In testimony whereof I afiix mysignature in presence of two witnesses.

CLARK F. RIGBY. 'Witnesses J. M. NESBI'I, F. E. GAITHER. 

